7y-21=4y-4

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Solution for 7y-21=4y-4 equation:


Simplifying
7y + -21 = 4y + -4

Reorder the terms:
-21 + 7y = 4y + -4

Reorder the terms:
-21 + 7y = -4 + 4y

Solving
-21 + 7y = -4 + 4y

Solving for variable 'y'.

Move all terms containing y to the left, all other terms to the right.

Add '-4y' to each side of the equation.
-21 + 7y + -4y = -4 + 4y + -4y

Combine like terms: 7y + -4y = 3y
-21 + 3y = -4 + 4y + -4y

Combine like terms: 4y + -4y = 0
-21 + 3y = -4 + 0
-21 + 3y = -4

Add '21' to each side of the equation.
-21 + 21 + 3y = -4 + 21

Combine like terms: -21 + 21 = 0
0 + 3y = -4 + 21
3y = -4 + 21

Combine like terms: -4 + 21 = 17
3y = 17

Divide each side by '3'.
y = 5.666666667

Simplifying
y = 5.666666667

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